A070525 -id:A070525 - cp's OEIS frontend

A070526 Value of n-th cyclotomic polynomial at 2^n.

1, 5, 73, 257, 1082401, 4033, 4432676798593, 4294967297, 18014398643699713, 1098438933505, 1298708349570020393652962442872833, 281474959933441, 91355004067076339167413824240109498970069278721

Offset: 1

Labos Elemer, May 02 2002

			n=5: a(5)=C[5,32]=1+32+1024+32768+1048576=1082401

Cf. A070518-A070525.

Mathematica
```
Table[Cyclotomic[w, 2^w], {w, 1, 15}]
```

A088856 Primes p such that cyclotomic(p,p-1) is prime.

Original entry on oeis.org

2, 3, 7, 127, 8599

Offset: 1

T. D. Noe, Nov 23 2003

Some of the larger entries may only correspond to probable primes.

For p > 2, these are numbers p such that ((p-1)^p - 1)/(p-2) is prime. - Thomas Ordowski, Sep 02 2021

Eric Weisstein's World of Mathematics, Cyclotomic Polynomial

Cf. A070519, A070525, A101753.

lst={}; Do[p=Prime[n]; If[PrimeQ[Cyclotomic[p, p-1]], AppendTo[lst, p]], {n, 400}]; lst

isok(p) = isprime(p) && isprime(polcyclo(p, p-1)); \\ Michel Marcus, Sep 02 2021

a(n) = A101753(n) + 1. - Thomas Ordowski, Sep 02 2021

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A070526 Value of n-th cyclotomic polynomial at 2^n.

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A088856 Primes p such that cyclotomic(p,p-1) is prime.

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